j-walk.com/ss/excel/index.htm : Series of FAQs , example downloads, books, mail lists, etc. - worth a visit.
Dave Steppan's Excel a la Carte : Has a series of example downloads
www.nonags.com : Extensive set of hgh quality downloads, does have some pop-up windows to annoy and the search engine is a bit of a pain.
www.thefreesite.com : Large freeware site with the usual email newsletter that does not have annoying pop-ups.
Web aid sites
www.milonic.com : A useful set of web page menus
www.freefind.com : A site specific search engine (see the top of this page). Very easy to install and seems to work well.
w.moreover.com : Adds current news (on subjects you specify to your web site).